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Heat and Mass Transfer

Heat and Mass Transfer
The unit of overall coefficient of heat transfer is

kcal/hr °C
kcal/m²
kcal/m² hr °C
kcal/m hr °C

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Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Fourth power of the absolute temperature
Cube of the absolute temperature
Square of the absolute temperature
Absolute temperature

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Heat and Mass Transfer
The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

Free convection
Forced convection
Radiation
Conduction

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Heat and Mass Transfer
Thermal diffusivity is a

Dimensionless parameter
All of these
Function of temperature
Physical property of a substance

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Heat and Mass Transfer
Depending on the radiating properties, a body will be white when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 0 and a = 1
X = 0, a + p = 1
P = 0, x = 1 and a = 0
P=1, T = 0 and a = 0

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Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = μ cp/k
RN = V²/t.cp
RN = ρ V l /μ
RN = hl/k

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